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Though a basic design element, generator pitch is a term often unfamiliar to users due to the extent of standardization within regions of the world. Because of standardization, pitch requirements may be omitted from generator specifications. Familiarization with generator pitch can therefore come as a crash course after equipment data sheets arrive for a generator of foreign construction. This paper will describe generator pitch along with other generator design criteria that affect output harmonics. For situations where it is impossible to achieve harmonic compatibility of sources, installation recommendations are provided that address control of harmonic driven circulating currents.

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The availability of computer programs which aide in protective device coordination studies has led to the assignment of coordination problems to those who are computer literate rather than protection literate. For those put in this unfortunate situation, some of the h e r points of time current coordination are presented which are often not leamed until after the news of that first false trip. This paper is intended as an addendum to, rather than a replacement for a typical time current coordination seminar.

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